Beeb is also used as slang for the British Broadcasting Corporation.
You're lucky if you had hundreds of them, we had little over a dozen (I'd guess 15 because it's half a standard class size but that is a very rough guess).
I remember we had 2 BBC master computers.
ECONET was awesome. We didn't have that at school but I did a course later on that had a server with a hard disk drive.
My school had a couple of computer rooms, with about 30 BBC model Bs in each and every classroom had one too... Probably approaching about a hundred machines in total... These were all on the ecconet, with a large central hard drive... Then in the early 90's they were all replaced with Archimedies A3000 (IIRC, then later, quite a few were upgraded to A3020)... But I remember typing *I am MattParsons to log on and then access all my files